Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d20fbffe4ff2ec5…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 09:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2f6d249ab98649d27ae7aa5b32a6c9b SHA-1: 9fadaa397b23ec19f39f74a2065144dbeebdbfef SHA-256: 9d20fbffe4ff2ec5dcc0df186df0da582a115c851e4f5888c7866d275296242a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate these links are designed to be non-clustered and hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=a+girl+in+the+train+movie
    • http://andlupa.com/userfiles/file/85140170403.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f1349d54f---pemiwu.pdf
    • https://mecaniquekd.ca/upload/file/tewevep.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/45318536635.pdf
    • https://abe-rdc.com/userfiles/file/nagitisupa.pdf
    • https://sjalikave.hu/pictures/file/likiwerur.pdf
    • http://annassteen.com/ckfinder/userfiles/files/fabolifokedurevi.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/han7rosa0ekie1nud9a8d8c1g6/67773517148.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/44407236023.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/347c416d06829ef8956d58f9fcb3d282/zufip.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/87236904090.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-15/20210615215957703253.pdf
    • http://hytechplus.com/userfiles/file/86204825974.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e98850d8---pepopixisilejudujomozafa.pdf
    • http://yilip.net/userData/board/file/54342661909.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fb4ce4819---83071074841.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609711744fb07---72367642008.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pr98nps79envqr826r3mbne5l7/vuzifezinolasotomusodebeb.pdf
    • http://baigeleather.com/userfiles/file/64452207353.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c827b81700de04eb751a4d5592710f24/rebotusozijonaxusuki.pdf
    • http://onlinecommerce.bg/uploads/pages/files/43810202304.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5834af2169---81607963070.pdf
    • http://reguitti-engineering.it/userfiles/files/95267985129.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mhnejj55hnvf7sn86rtgsocej3/bufobividofekagojaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcaf.bin
cb1b285c160c577f88977b8157315a350117a9f185b7a0db5f954071b9892480
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10432 bytes
font_01_sfnt_off0001141e.bin
9fd354b6f1cd80ae1044210e439d85a506a9af218a1471ef33f8cc024267636f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1141E 17736 bytes
font_02_sfnt_off0001425f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1425F 16792 bytes